Nope. I am sure it is the 1.25", I use one on the rear of the ST80, with the ToUcam in the rear of that. Great for finding a guidestar, then auto-guiding.
Gary
I have the 2" version and it is an all metal construction. These Meade flip mirrors are not mass produced plastic rubbish. As marked in the photo, I understand they are manufactured in Japan and the quality and finish of the unit and mounting accessories (for the 2" at least) are top notch.